NullPointerException while trying to add ActionHandler

[dveermanster]

Hey,

I am trying work with GPD 3.0.8 on Eclipse 3.2

I've followed the steps of the "getting started" of GPD, till 4.2 "integrating Hello Action" because I click 'add action' and get a pop-up in which I can fill in the name and browse to the preferred action class but when I click oke I get the message to look in de log file because of an error:

!ENTRY org.eclipse.jface 4 0 2006-08-22 11:16:15.312
!MESSAGE java.lang.NullPointerException
!STACK 0
java.lang.NullPointerException
at org.jbpm.ui.properties.ActionHandlerPropertyPage.performOk(Unknown Source)
at org.eclipse.jface.preference.PreferenceDialog$11.run(PreferenceDialog.java:889)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.runtime.Platform.run(Platform.java:843)
at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:44)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:149)
at org.eclipse.jface.preference.PreferenceDialog.okPressed(PreferenceDialog.java:869)
at org.eclipse.ui.internal.dialogs.FilteredPreferenceDialog.okPressed(FilteredPreferenceDialog.java:377)
at org.eclipse.jface.preference.PreferenceDialog.buttonPressed(PreferenceDialog.java:230)
at org.eclipse.jface.dialogs.Dialog$3.widgetSelected(Dialog.java:660)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:90)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:928)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3348)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2968)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:820)
at org.eclipse.jface.window.Window.open(Window.java:796)
at org.eclipse.ui.dialogs.PropertyDialogAction.run(PropertyDialogAction.java:156)
at org.jbpm.ui.part.tree.ElementTreeEditPart.openPropertyDialog(Unknown Source)
at org.jbpm.ui.part.tree.ElementTreeEditPart.performRequest(Unknown Source)
at org.jbpm.ui.outline.DesignerOutlineViewer.handleDoubleClick(Unknown Source)
at org.jbpm.ui.outline.DesignerOutlineViewer.access$3(Unknown Source)
at org.jbpm.ui.outline.DesignerOutlineViewer$4.mouseDoubleClick(Unknown Source)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:141)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:928)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3348)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2968)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1914)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1878)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:419)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:95)
at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336)
at org.eclipse.core.launcher.Main.basicRun(Main.java:280)
at org.eclipse.core.launcher.Main.run(Main.java:977)
at org.eclipse.core.launcher.Main.main(Main.java:952)

Also tried it with the added MessageActionHandler class which was already in the GPD package but got the same error.

Does anyone have a clue what might be the problem?

thanks in advance!


p.s. I found that with my configuration the JpdlXmlReader.parseProcessDefinition method used in the HelloTest.java in the tutorial does not exist, so I had to change code into:

import org.xml.sax.InputSource;
:
:
InputSource inputsource =
new InputSource("src/java/hello.par/processdefinition.xml");

JpdlXmlReader reader = new JpdlXmlReader(inputsource);
ProcessDefinition definition = reader.readProcessDefinition();

[kukeltje]

GPD 3.08 is not certified for use on Eclipse 3.2, Use 3.0.11.

Regarding the tutorial 'error', this is known, and has been discussed lots of times in this forum

[dveermanster]

I couldn't find 3.0.11 but because the tutorial used 3.1 I'd downloaded that one to test.

I seem to have the same problem also with 3.1.
I've made the easiest process: start-state-end, tried to add an action to the start-state transition.
After selecting the MessageActionHandler class and clicking OK I got the pop-up again....

[kukeltje]

3.0.11 is here http://www.jboss.com/products/jbpm/downloads

and AAAAAHHHHHH

http://labs.jboss.com/portal/jbossjbpm/download/ shows 3.0.8

I'd love to use a four letter word now.... :-)

[dveermanster]

Aha that explains :)

It seems to work now, thanks for the help!

[kukeltje]

Where do you study? I'm curious for users in the Netherlands. If you do not want to post here, send a private message to my jbpm adres in my profile.

[dveermanster]

I study at the Vrije Universiteit Amsterdam :)

currently I'm doing my final project to graduate for my masters and for that I'm researching the implications of open source usage at component based development, by study and experiment.

I'm now at the stage where I'm gona try to integrate jBPM with an open source document management system as a proof of concept..